Comparison of Cu(II) adsorption using fly ash and natural sorbents during temperature change and thermal-alkaline treatment

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dc.contributor.authorĎuricová, Anna
dc.contributor.authorPrepilková, Veronika
dc.contributor.authorSečkár, Michal
dc.contributor.authorSchwarz, Marián
dc.contributor.authorSamešová, Dagmar
dc.contributor.authorMurajda, Tomáš Andrej
dc.contributor.authorAndráš, Peter
dc.contributor.authorEštoková, Adriana
dc.contributor.authorČambál Hološová, Miriama
dc.contributor.authorPoništ, Juraj
dc.contributor.authorZacharová, Andrea
dc.contributor.authorSchmidtová, Jarmila
dc.contributor.authorVeverková, Darina
dc.contributor.authorBiroň, Adrián
dc.date.accessioned2026-03-20T12:16:39Z
dc.date.available2026-03-20T12:16:39Z
dc.date.issued2025
dc.descriptionIn: Materials. Basel : Multidisciplinary Digital Publishing Institute, 2025. ISSN 1996-1944. Vol. 18, no. 19 (2025), pp. 1-41.
dc.description.abstractMine effluents represent a serious environmental problem on a global scale. Therefore, the effective treatment of this water is a serious issue in the scientific field. The adsorption process seems to be one of the attractive methods, especially due to the simplicity of design, affordability or high efficiency. The latest scientific knowledge has shown that the use of waste and natural adsorbents is economical and effective. This study aimed to evaluate the efficiency of the adsorption process of natural and waste materials—zeolite, bentonite and fly ash—under the influence of temperature and modification of these adsorbents. The novelty of this study resides in an adjustment of the modification method of adsorbents compared to previous research: thermal–alkaline treatment versus hydrothermal one. Another novelty is the use of modified fly ash from biomass combustion as an adsorbent in comparison with the previously used fly ash from coal combustion. The modification of the adsorbents made the adsorption process more effective at all experimental concentrations. The characterisation of adsorbent samples was performed using X-ray diffraction (XRD). The parameters of the adsorption isotherms, Langmuir, Freundlich and Temkin, were estimated by nonlinear regression analysis. The adsorption capacity of Cu(II) of fly ash was comparable to natural adsorbents. Adsorption processes were better described by pseudo-second-order kinetics. At the end of this study, the suitability of using the adsorbents to reduce the concentration of Cu(II) in neutral mine effluents was observed in the following order at 30 °C: unmodified fly ash > modified bentonite > unmodified zeolite. At the temperatures of 20 °C and 10 °C, the same trend of the suitability of adsorbents use was confirmed: modified bentonite > modified zeolite > modified fly ash. The practical applicability of this study lies in the expansion of knowledge in the field of adsorption processes and in the improvement of waste management efficiency of heating plants not only in Slovakia, but also globally.
dc.description.sponsorshipITMS 313011T721 Komplexný výskum determinantov pre zabezpečenie environmentálneho zdravia
dc.identifier.doihttps://doi.org/10.3390/ma18194552
dc.identifier.issn1996-1944
dc.identifier.urihttps://repo.umb.sk/handle/123456789/1354
dc.language.isoen
dc.publisherMultidisciplinary Digital Publishing Institute : Basel
dc.rightsCC BY Creative Commons Attribution 4.0. International
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectťažké kovy
dc.subjectheavy metals
dc.subjectodvodňovanie baní
dc.subjectpopolčeky
dc.subjectadsorpcia kovov
dc.subjectmetal adsorption
dc.titleComparison of Cu(II) adsorption using fly ash and natural sorbents during temperature change and thermal-alkaline treatment
dc.typeArticle
dc.typeinfo:eu-repo/semantics/article

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